煤炭开采和洗选业年平均从业人数预测研究——基于灰色系统GM(1,1)模型
李娜
Prediction and Study on Annual Average Employee Number of Coal Mining and Coal Preparation Industry – base on Gray System GM (1.1) Model
LI Na
煤炭经济研究 . 2012, (11): 60 -63 .  DOI: A